◆Inspection power transistor
Remove the fasten terminal and test
output voltage
◆Inspection of outdoor fan motor
See page 214.
◆Inspection of resistance value of sensor
Remove the connector and check the resistance value.
See the section of sensor characteristics on page 205.
FMo
RD
CNTH
CNFAN
M
2 2 2
t゜
t゜
2
t゜
t゜
TH1 TH2 TH3 TH4
T2
T1
L
OR
YE
T12
T11
L
OR
YE
20S
CN20S
BK
WH
RD
V W
U
CM
M
3～
CNSUB
S-2
C-2
CNTH
CNFAN
②
①
⑤
Models SCM50ZS-S1,60ZM-S1
CAUTION- HIGH VOLTAGE
High voltage is produced in the control box. Don't touch
electrical parts in the control box for 5 minutes after the
unit is stopped.
◆Power source and serial signal inspection
① to ②: AC 220/230/240V
② to ③ : Normal if the voltage oscillates between
DC 0 and approx. 20V
Power source
1 Phase
AC220-240V 50Hz
220V 60Hz
◆Inspection of electronic
expansion valve
See page 214.
Color marks
Mark Color
BK
BR
Black
BL Blue
BR Brown
Brown
RD
Y／G
Red
Yellow ／Green
WH White
OR Orange
YE Yellow
EEV A
BK
WH
WH
S-1
CNMAIN
S
O
RO
G2
Y／G
RD
C-1
CN20V
5
2
CNEEV1
CNEEV3
EEV B EEV C
M
M
M
WH
RD BL
PCB 2（SUB）
PCB 1（MAIN）
Display Voltage range
◆Voltage check in PCB
The normal range is as follows.
①DC280V DC230V - DC310V
②DC220V DC218V - DC222V
③DC213V DC212V - DC214V
④DC215V DC214V - DC216V
⑤DC225V DC224V - DC226V
⑥DC 2.5V DC 2.3V - DC
2
2.5V
WH
HEATER
CNHEAT
RS
③
⑥
④
UNIT A
UNIT B
UNIT C
SIN
R
IN
BK
WH
FUSE
F4
G1
Y/G
G
Y/G
TB2
CNA
CNB
CNC
TB1
N
L
Y/G
WH
BK
250V 20A
3
2
1
BK
WH
RD
3
2
1
3
2
1
BK
WH
BR
BK
WH
BL
(12) Outdoor unit inspection points
-
213
-
'18 • SCM-T-251
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